US10644840B2 - Methods of efficient HARQ operation for low latency and high performance services - Google Patents

Methods of efficient HARQ operation for low latency and high performance services Download PDF

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US10644840B2
US10644840B2 US16/105,109 US201816105109A US10644840B2 US 10644840 B2 US10644840 B2 US 10644840B2 US 201816105109 A US201816105109 A US 201816105109A US 10644840 B2 US10644840 B2 US 10644840B2
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harq
ack
ack timing
capability
supported
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US20190058554A1 (en
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Pei-Kai Liao
Ming-Che Lu
Yen-Shuo Chang
Chien-Hwa Hwang
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MediaTek Inc
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MediaTek Inc
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Priority to PCT/CN2018/101443 priority patent/WO2019037696A1/en
Assigned to MEDIATEK INC. reassignment MEDIATEK INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHANG, YEN-SHUO, HWANG, CHIEN-HWA, LIAO, PEI-KAI, LU, Ming-Che
Publication of US20190058554A1 publication Critical patent/US20190058554A1/en
Priority to TW108129604A priority patent/TWI702815B/zh
Priority to US16/835,457 priority patent/US20200228249A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • H04L1/1845—Combining techniques, e.g. code combining
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1848—Time-out mechanisms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1864—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices

Definitions

  • the disclosed embodiments relate to Hybrid Automatic Repeat Request (HARQ) operation, and more specifically, to adaptive HARQ feedback timing and adaptive HARQ process number with fixed HARQ soft buffer size in next generation 5G new radio (NR) mobile communication networks.
  • HARQ Hybrid Automatic Repeat Request
  • LTE Long-Term Evolution
  • GSM Global System for Mobile communications
  • UMTS Universal Mobile Telecommunication System
  • E-UTRAN an evolved universal terrestrial radio access network
  • eNodeBs or eNBs evolved Node-Bs communicating with a plurality of mobile stations, referred as user equipments (UEs).
  • UEs user equipments
  • Enhancements to LTE systems are considered so that they can meet or exceed International Mobile Telecommunications Advanced (IMT-Advanced) fourth generation (4G) standard.
  • IMT-Advanced International Mobile Telecommunications Advanced
  • 5G new radio The signal bandwidth for next generation 5G new radio (NR) system is estimated to increase to up to hundreds of MHz for below 6 GHz bands and even to values of GHz in case of millimeter wave bands. Furthermore, the NR peak rate requirement can be up to 20 Gbps, which is more than ten times of LTE. It is therefore expected that 5G NR system needs to support dramatically larger transport block (TB) sizes as compared to LTE, which result in a much more code block (CB) segments per TB.
  • Three main applications in 5G NR system include enhanced Mobile Broadband (eMBB), Ultra-Reliable Low Latency Communications (URLLC), and massive Machine-Type Communication (MTC) under milli-meter wave technology, small cell access, and unlicensed spectrum transmission. Multiplexing of eMBB & URLLC within a carrier is also supported.
  • eMBB enhanced Mobile Broadband
  • URLLC Ultra-Reliable Low Latency Communications
  • MTC massive Machine-Type Communication
  • Hybrid Automatic Repeat ReQuest is employed for error detection and correction.
  • HARQ is a combination of forward error correction (FEC) and Automatic Repeat ReQuest (ARQ). It uses error detection to detect uncorrectable errors. The packets in error are discarded and the receiver requests retransmission of corrupted packets. In a standard ARQ, error detection bits are added to data to be transmitted. In Hybrid ARQ, error correction bits are also added. When the receiver receives a data transmission, the receiver uses the error detection bits to determine if data has been lost. If it has, then the receiver may be able to use the error correction bits to recover the lost data.
  • FEC forward error correction
  • ARQ Automatic Repeat ReQuest
  • the receiver may use a second transmission of additional data (including more error correction information) to recover the data.
  • Error correction can be performed by combining information from the initial transmission with additional information from one or more subsequent retransmissions.
  • HARQ consists of multiple HARQ processes with each operation on a single transport block (TB).
  • the transmitter stops and waits for an acknowledgement (ACK) from the receiver, called HARQ-ACK, after each transmission of TB.
  • ACK acknowledgement
  • the HARQ-ACK indicates whether the TB is correctly received or not.
  • 3GPP 5G NR data services with low latency becomes a key differentiation from 4G LTE. From a latency perspective, the time between the reception of data and transmission of HARQ-ACK should be as short as possible. However, an unnecessarily short time would increase the demand on the processing capability. To achieve low latency, UE throughput may be sacrificed for a tradeoff due to UE hardware limitation and power consumption.
  • a single HARQ operation scheme is sought to support the tradeoff between low-latency and high-performance.
  • HARQ Hybrid Automatic Repeat Request
  • RAT radio access technology
  • UE signals the network its HARQ-ACK timing capability.
  • an adaptive number of HARQ processes is applied with a fixed HARQ soft buffer size because the hardware cost for HARQ soft buffer does not linearly increase with the number of HARQ processes.
  • UE determines a nominal HARQ soft buffer size and HARQ soft buffer size for each HARQ process based on a network-configured HARQ process number.
  • a UE transmits hybrid automatic repeat request (HARQ) capability information in a wireless communication network.
  • the HARQ capability information comprises a supported HARQ-ACK timing capability associated with a list of parameters.
  • the UE receives a higher-layer configuration from the network that configures a set of applicable HARQ-ACK timings.
  • the UE receives a physical-layer signaling from the network that configures an applied HARQ-ACK timing for a downlink data packet.
  • the UE transmits an HARQ ACK/NACK in response to the downlink data packet based on the applied HARQ-ACK timing.
  • a UE receives a higher-layer signaling in a wireless communication network.
  • the higher-layer signaling indicates a number of configured hybrid automatic repeat request (HARQ) processes.
  • the UE determines a nominal HARQ soft buffer size for a channel coding chain rate matching based on a UE category.
  • the UE determines an HARQ soft buffer size for each HARQ process by dividing the nominal HARQ soft buffer size with the number of configured HARQ processes.
  • the UE performs HARQ operation based on the nominal HARQ soft buffer size and an actual HARQ soft buffer size of the UE.
  • FIG. 1 illustrates a mobile communication network with adaptive HARQ feedback timing and adaptive HARQ process number for HARQ operation in accordance with one novel aspect.
  • FIG. 2 illustrates one embodiment of HARQ operation with adaptive HARQ-ACK timing in accordance with one novel aspect.
  • FIG. 3 illustrates a sequence flow of an HARQ operation with adaptive HARQ-ACK timing in accordance with one novel aspect.
  • FIG. 4 illustrates one embodiment of HARQ operation with adaptive HARQ process number with fixed soft buffer size in accordance with one novel aspect.
  • FIG. 5 illustrates a sequence flow of an HARQ operation with adaptive HARQ process number with fixed soft buffer size in accordance with one novel aspect.
  • FIG. 6 is a flow chart of a method of applying adaptive HARQ-ACK timing for HARQ operation in accordance with one novel aspect.
  • FIG. 7 is a flow chart of a method of applying adaptive HARQ process number with a fixed HARQ soft buffer size for HARQ operation in accordance with one novel aspect.
  • FIG. 1 illustrates a next generation 5G new radio (NR) mobile communication network 100 with adaptive HARQ ACK timing and adaptive HARQ process number for Hybrid Automatic Repeat Request (HARQ) operation in accordance with one novel aspect.
  • Mobile communication network 100 is a 5G NR system having a base station BS 101 and a user equipment UE 102 .
  • Three main applications in 5G NR include enhanced Mobile Broadband (eMBB), Ultra-Reliable Low Latency Communications (URLLC), and massive Machine-Type Communication (MTC) under milli-meter wave technology, small cell access, and unlicensed spectrum transmission. Multiplexing of eMBB & URLLC within a carrier is supported.
  • eMBB enhanced Mobile Broadband
  • URLLC Ultra-Reliable Low Latency Communications
  • MTC massive Machine-Type Communication
  • BS 101 For downlink (DL) data transmission, at the transmitter side, BS 101 takes a new transport block (TB) as encoder input, performs encoding via encoder 111 and rate matching via rate-matching module 112 , and generates a codeword 113 corresponding to TB 110 to be transmitted to UE 102 over wireless channel 120 . The BS then performs rate matching based on physical resource allocation. It is expected that 5G NR needs to support dramatically larger TB sizes as compared to LTE, which result in much more code block (CB) segments per TB. In another word, TB 110 may contain up to one hundred CBs.
  • CB code block
  • UE 102 receives codeword 113 having multiple CBs, performs decoding via decoder 141 , and sends out an ACK or NACK back to BS 101 based on the decoding result under HARQ operation.
  • HARQ consists of multiple HARQ processes with each operating on a single TB.
  • the transmitter BS 101 stops and waits for an HARQ-ACK or HARQ-NACK from the receiver UE 102 after each transmission of TB. If a new TB turns out to be an erroneous TB after decoding, then BS 101 retransmits the TB after receiving the NACK, and UE 102 performs HARQ operation via HARQ controller 142 and HARQ buffer management circuit 143 .
  • the HARQ controller 142 assigns an HARQ process, stores the erroneous TB in a corresponding soft buffer allocated from HARQ buffer management circuit 143 , and waits for retransmission data from BS 101 to perform data recovery.
  • TB #1 is associated with HARQ process #1 having soft buffer #1
  • TB #2 is associated with HARQ process #2 having soft buffer #2 . . . and so on so forth.
  • 3GPP 5G NR data services with low latency becomes a key differentiation from 4G LTE. From a latency perspective, the time between the reception of data and transmission of HARQ-ACK should be as short as possible. However, an unnecessarily short time would increase the demand on the processing capability. To achieve low latency, UE throughput may be sacrificed for a tradeoff due to UE hardware limitation and power consumption.
  • an efficient HARQ operation to support both low-latency and high-performance services in one radio access technology (RAT) is proposed. Under the proposed single HARQ operation scheme, an adaptive HARQ-ACK feedback timing is applied based on UE conditions and UE capability to support the tradeoff between low-latency and high-performance. Furthermore, an adaptive number of HARQ processes is applied with a fixed HARQ soft buffer size because the hardware cost for HARQ soft buffer does not linearly increase with the number of HARQ processes.
  • FIG. 1 further illustrates a simplified block diagram of UE 102 that carries embodiments of the present invention.
  • UE 102 comprises memory 131 , a processor 133 , an RF transceiver 134 , and an antenna 135 .
  • RF transceiver 134 coupled with antenna 135 , receives RF signals from antenna 135 , converts them to baseband signals and sends them to processor 133 .
  • RF transceiver 134 also converts received baseband signals from processor 133 , converts them to RF signals, and sends out to antenna 135 .
  • Processor 133 processes the received baseband signals and invokes different functional modules and circuits to perform features in UE 102 .
  • Memory 131 stores program instructions and data 132 to control the operations of UE 102 .
  • the program instructions and data 132 when executed by processor 133 , enables UE 102 to decode TBs and perform HARQ operation accordingly.
  • UE 102 also comprise various function modules and circuits that can be implemented and configured in a combination of hardware circuits and firmware/software codes being executable by processors 133 to perform the desired functions. Each functional module or circuit may comprise a processor together with corresponding program codes.
  • UE 102 comprises a configuration module 140 for determining and configuring HARQ related capabilities and parameters, a decoder 141 that decodes new TBs, and an HARQ module 121 further comprising HARQ controller 142 and HARQ buffer 143 for supporting the HARQ scheme with adaptive HARQ-ACK timing and adaptive HARQ process number.
  • the UE signals the HARQ capability, e.g., UE-supported HARQ-ACK timing under different conditions to the network, and also determines a fixed HARQ soft buffer size with a network-configured HARQ process number.
  • FIG. 2 illustrates one embodiment of HARQ operation with adaptive HARQ-ACK timing in accordance with one novel aspect.
  • Wireless communication is carried over a wireless channel in the form of radio frames, each radio frame consists of a number of subframes as defined in 4G specification.
  • a subframe is also referred to as a slot in 5G specification.
  • Each subframe or slot consists of a number of OFDM symbols.
  • PDSCH physical downlink shared channel
  • PUCCH physical uplink control channel
  • HARQ RTT timer There is one HARQ RTT timer per DL HARQ process.
  • Active Time for a PDCCH-subframe, for example, if the subframe is not part of a configured measurement gap, and if the PDCCH indicates a DL transmission or if a DL assignment has been configured for this subframe, then UE will start the HARQ RTT Timer for the corresponding HARQ process.
  • HARQ RTT timer is eight subframes.
  • the duration of HARQ RTT Timer is set to k+4 subframes, where k is the interval between the downlink transmission and the transmission of associated HARQ ACK feedback.
  • the first parameter is k, which means given a DL transmission in a subframe, after k subframe, UE should feedback ACK/NACK to eNB.
  • HARQ operation timings are supported in a wireless communication system.
  • three different HARQ-ACK timings are illustrated.
  • HARQ-ARK timing with longer RTT may be applied to achieve higher throughput.
  • HAR-ACK timing with shorter RTT may be applied to achieve lower delay.
  • the HARQ-ACK timing thus may be adaptively configured.
  • FIG. 2 also illustrates the HARQ-ACK timing for the downlink (N1 symbols) and the uplink scheduling timing for the uplink (N2 symbols).
  • HARQ-ACK timing is related to the time difference between the end of physical downlink shared channel (PDSCH) reception of a data packet and the start of physical uplink control channel (PUCCH) transmission of corresponding HARQ-ACK.
  • N1 symbols depicts the time difference and such time difference is related to UE processing time, so HARQ-ACK timing is dominated by the maximum data bits carried in PDSCH.
  • UE processing time is defined as a number of OFDM symbols in 3GPP 5G specs while HARQ-ACK timing is determined with a number of subframes or slots. Therefore, HARQ-ACK timing should be able to accommodate UE processing time.
  • FIG. 3 illustrates a sequence flow of an HARQ operation with adaptive HARQ-ACK timing in accordance with one novel aspect.
  • UE 301 establishes a radio resource control (RRC) connection with gNB 302 .
  • RRC radio resource control
  • UE 301 signals to the eNB 302 its capability of one or multiple HARQ-ACK timing(s). If multiple HAR-ACK timings are supported by the UE, UE additionally signals at least one of the following parameters associated to each HAR-ACK timing.
  • Option 2 the information related to maximum number of scheduled information bits for DL within a subframe/slot, e.g., transport block size, X % maximum number information bits within a subframe/slot based on the corresponding UE category.
  • Option 3 the information related to maximum number of scheduled coded bits for DL within a subframe/slot per carrier or all carriers.
  • Option 4 the information related to maximum number of scheduled physical resource blocks (PRBs), e.g., equal to maximum number of scheduled PRBs per MIMO layer multiplied with maximum number of MIMO layers for DL within a subframe/slot per carrier or all carriers. Note that a larger PRB number can accommodate more data bits in PDSCH.
  • the HARQ-ACK timing capability signaled in step 312 is indicated by a minimum processing time supported by UE 301 .
  • gNB 302 transmits a higher-layer signaling based on the UE capability.
  • the network signals a subset of the supported HARQ-ACK timings to the UE, which contains one or multiple HARQ-ACK applicable timings.
  • gNB 302 transmits a DL data packet, and a physical-layer signaling regarding an actual applied HARQ-ACK timing for the DL data packet.
  • a new TB is encoded into a plurality of CBs by gNB 302 to be transmitted over a wireless channel.
  • UE 301 performs TB or retransmitted data decoding and checks whether the decoding is successful.
  • HARQ TB ACK is feedback to the transmitter in step 316 .
  • HARQ TB NACK is feedback to the transmitter in step 316 .
  • the UE-supported HARQ-ACK timing is associated with a list of specified conditions. First, it is related to subcarrier spacing (SCS) and corresponding subframe/slot duration of the subframe/slot for the DL data channel. Second, it is related to subframe, slot, or mini-slot size of the DL data channel in terms of the number of OFDM symbols. Usually HARQ-ACK timing is determined with a number of subframes/slots. HARQ-ACK timing is related to UE processing time, which can't be linearly scaled with the subcarrier spacing. So HARQ-ACK timing depends on subcarrier spacing and subframe/slot length (in terms of OFDM symbols).
  • the starting time UE can process the data bits carried in PDSCH also depends on when DMRS is received. This is because data decoding can't be started before channel estimation based on DMRS is done. Therefore, the earlier DMRS is received, the earlier UE processing PDSCH can be completed.
  • UE is not expected to transmit corresponding HARQ-ACK in uplink for a scheduled DL data packet if the network set the HARQ-ACK timing without meeting the signaled UE capability and the list of specified corresponding conditions.
  • FIG. 4 illustrates one embodiment of HARQ operation with adaptive HARQ process number with fixed soft buffer size in accordance with one novel aspect.
  • the nominal HARQ soft buffer size for channel coding chain rate matching is specified based on a HARQ operation round-trip time (e.g. 2 ms or 4 ms) & a targeted data rate.
  • the HARQ operation round-trip time is determined according to a targeted HARQ performance.
  • the actual total HARQ soft buffer within a UE can be different from the nominal HARQ soft buffer size for channel coding chain.
  • K 2 is determined based on the specified maximum HARQ operation round-trip time, wherein K 2 ⁇ K 1 .
  • the network will configure an actual applied HARQ process number K 3 to UE via higher-layer signaling. For example, the network may determine K 3 based on the latency or performance requirement of each application.
  • FIG. 5 illustrates a sequence flow of an HARQ operation with adaptive HARQ process number with fixed soft buffer size in accordance with one novel aspect.
  • UE 501 establishes a radio resource control (RRC) connection with gNB 502 .
  • RRC radio resource control
  • gNB 502 signals the actual applied HARQ process number K 3 to UE 501 .
  • the signaling can be physical-layer (layer 1), MAC-layer (layer 2) or RRC-layer (layer 3) signaling.
  • UE 501 determines the nominal HARQ soft buffer size for channel coding chain.
  • UE 501 also determines the soft buffer size for each HARQ process, by dividing the determined nominal HARQ soft buffer size with the configured HARQ process number K 3 .
  • UE 501 receives a DL data packet from gNB 502 .
  • UE 501 performs TB or retransmitted data decoding and checks whether the decoding is successful. If all the CBs in a TB are correctly decoded, then HARQ TB ACK is feedback to the transmitter in step 516 . On the other hand, if at least one CB in a TB is not correctly decoded, then HARQ TB NACK is feedback to the transmitter in step 516 .
  • FIG. 6 is a flow chart of a method of applying adaptive HARQ-ACK timing for HARQ operation in accordance with one novel aspect.
  • a UE transmits hybrid automatic repeat request (HARQ) capability information in a wireless communication network.
  • the HARQ capability information comprises a supported HARQ-ACK timing capability associated with a list of parameters.
  • the UE receives a higher-layer configuration from the network that configures a set of applicable HARQ-ACK timings.
  • the UE receives a physical-layer signaling from the network that configures an applied HARQ-ACK timing for a downlink data packet.
  • the UE transmits an HARQ ACK/NACK in response to the downlink data packet based on the applied HARQ-ACK timing.
  • FIG. 7 is a flow chart of a method of applying adaptive HARQ process number with a fixed HARQ soft buffer size for HARQ operation in accordance with one novel aspect.
  • a UE receives a higher-layer signaling in a wireless communication network.
  • the higher-layer signaling indicates a number of configured hybrid automatic repeat request (HARQ) processes.
  • the UE determines a nominal HARQ soft buffer size for a channel coding chain rate matching based on a UE category.
  • the UE determines an HARQ soft buffer size for each HARQ process by dividing the nominal HARQ soft buffer size with the number of configured HARQ processes.
  • the UE performs HARQ operation based on the nominal HARQ soft buffer size and an actual HARQ soft buffer size of the UE.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
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Application Number Priority Date Filing Date Title
US16/105,109 US10644840B2 (en) 2017-08-21 2018-08-20 Methods of efficient HARQ operation for low latency and high performance services
CN201880014946.XA CN110352577B (zh) 2017-08-21 2018-08-21 高效混合自动重传请求操作方法及其用户设备
PCT/CN2018/101443 WO2019037696A1 (en) 2017-08-21 2018-08-21 EFFICIENT HARQ OPERATION METHODS FOR LOW-LATENCY AND HIGH-PERFORMANCE SERVICES
TW108129604A TWI702815B (zh) 2017-08-21 2019-08-20 高效混合自動重傳請求運作方法及其使用者設備
US16/835,457 US20200228249A1 (en) 2017-08-21 2020-03-31 Methods of Efficient HARQ Operation for Low Latency and High Performance Services

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